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Effects of molecule anchoring and dispersion on nanoscopic friction under electrochemical control
Stockholm University, Faculty of Science, Department of Physics.
Number of Authors: 4
2016 (English)In: Journal of Physics: Condensed Matter, ISSN 0953-8984, E-ISSN 1361-648X, Vol. 28, no 10, 105001Article in journal (Refereed) Published
Abstract [en]

The application of electric fields is a promising strategy for in situ control of friction. While there have recently been many experimental studies on friction under the influence of electric fields, theoretical understanding is very limited. Recently, we introduced a simple theoretical model for friction under electrochemical conditions that focused on the interaction of a force microscope tip with adsorbed molecules whose orientation was dependent on the applied electric field. Here we focus on the effects of anchoring of the molecules on friction. We show that anchoring affects the intensity and width of the peak in the friction that occurs near a reorientation transition of adsorbed molecules, and explain this by comparing the strength of molecule-molecule and molecule-tip interactions. We derive a dispersion relation for phonons in the layer of adsorbed molecules and demonstrate that it can be used to understand important features of the frictional response.

Place, publisher, year, edition, pages
2016. Vol. 28, no 10, 105001
Keyword [en]
friction, molecule geometry, electrochemistry, simple model
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-128504DOI: 10.1088/0953-8984/28/10/105001ISI: 000371007800006PubMedID: 26871411OAI: oai:DiVA.org:su-128504DiVA: diva2:918405
Available from: 2016-04-11 Created: 2016-03-30 Last updated: 2016-04-11Bibliographically approved

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de Wijn, Astrid S.
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